BIOchp6.1 - Ground Rules of Metabolism Chapter 6 Part 1...

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Unformatted text preview: Ground Rules of Metabolism Chapter 6 Part 1 Impacts, Issues: A Toast to Alcohol Dehydrogenase In the liver, alcohol dehydrogenase helps break down toxic alcohols, but at the expense of liver function and energy metabolism Fig. 6-1a, p. 92 Fig. 6-1b, p. 92 Fig. 6-1b, p. 92 alcohol dehydrogenase 6.1 Energy and the World of Life Assembly of the molecules of life starts with energy input into living cells Energy Disperses First law of thermodynamics Energy is neither created nor destroyed, but can be transferred from one form to another Second law of thermodynamics Entropy (a measure of dispersal of energy in a system) increases spontaneously The entropy of two atoms decreases when a bond forms between them (endergonic reaction) Motion: A Form Of Energy Entropy Fig. 6-3, p. 94 entropy heat energy time entropy heat energy time Fig. 6-3, p. 94 Stepped Art One Way Flow of Energy The total amount of energy available in the universe to do work is always decreasing Each time energy is transferred, some energy escapes as heat (not useful for doing work) On Earth, energy flows from the sun, through producers, then consumers Living things need a constant input of energy Energy Conversion Only about 10% of the energy in food goes toward building body mass, most is lost in energy conversions Energy Flow Fig. 6-5, p. 95 energy input, mainly from sunlight ENERGY IN Sunlight energy reaches environments on Earth. Producers of nearly all ecosystems secure some and convert it to stored forms of energy. They and all other organisms convert stored energy to forms that can drive cellular work. PRODUCERS plants and other self- feeding organisms nutrient cycling ENERGY OUT CONSUMERS animals, most fungi, many protists, bacteria With each conversion, there is a one-way flow of a bit of energy back to the environment. Nutrients cycle between producers and consumers....
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This note was uploaded on 03/30/2012 for the course BIO 100 taught by Professor Corbet during the Spring '12 term at Paradise Valley Community College .

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BIOchp6.1 - Ground Rules of Metabolism Chapter 6 Part 1...

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